x∧2-3x+3/（x-4）∧2
    （(2584+1352*3-126*3-6140)/6140)*0.5=((1845+X)-3716)/3716
    （(2584+1352*2-126*2-6140)/6140)*0.5=((1845+X)-3716)/3716
    （220*2*26-x）*0.9+18*26=9122.88
    （(2584+1352-126-6140)/6140)*0.5=((1845+X)-3716)/3716
    911.5*x - 0.0221=10
    911.5*x - 0.0221=4
    0.07=0.0003×x^2-0.0161x+0.2626
    0.07=0.0003×x2-0.0161x+0.2626
    8%*x+9%*(6000-x)=500
    (720-x)/x=-0.1
    3*x+5*(42-x)=150
    (720-x)/x=0.1
    15.2953=(354.8304-x)/log((364.8304-x)/10)
    15.1266=(353.378-x)/log((363.378-x)/10)
    200+0.5y+500=y
    0.9956*x - 0.0039=1
    0.9956*x - 0.0039=0.3
    411.52*x - 0.0535=10
    411.52*x - 0.0535=4

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